第597篇Variations in the Climate

第629篇The History of Communication Technology

TF阅读真题第662篇A Transportation Transformation

018Cereals and Legumes A Partnership讲解

050Extinctions at the End of the Cretaceous讲解

082Motor Development in Children讲解

114The Development of Printing讲解

146Wet and Dry Periods on the Great Plains讲解

TF阅读真题第706篇A Revolution in Consumption in the Eighteenth Century

TF阅读真题第738篇Sauropods and Conifers